[PATCH 0/2] two clean up patches for mballoc

[PATCH 0/2] two clean up patches for mballoc

[Guoqing Jiang]

Hi,

Please review the two patches which clean up code a bit.

Thanks,
Guoqing

Guoqing Jiang (2):
  ext4: cleanup ext4_issue_discard
  ext4: make ext4_mb_release_group_pa returns void

 fs/ext4/mballoc.c | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

-- 
2.35.3

[PATCH 1/2] ext4: cleanup ext4_issue_discard

[Guoqing Jiang]

We can remove the 'biop' parameter and remove the 'if'
branch in ext4_issue_discard, since all call sites pass
NULL to biop with commit 55cdd0af2bc5 ("ext4: get discard
out of jbd2 commit kthread contex").

Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
---
 fs/ext4/mballoc.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 7b2e36d103cb..5fabb34869bf 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3604,8 +3604,7 @@ int ext4_mb_release(struct super_block *sb)
 }
 
 static inline int ext4_issue_discard(struct super_block *sb,
-		ext4_group_t block_group, ext4_grpblk_t cluster, int count,
-		struct bio **biop)
+		ext4_group_t block_group, ext4_grpblk_t cluster, int count)
 {
 	ext4_fsblk_t discard_block;
 
@@ -3614,13 +3613,7 @@ static inline int ext4_issue_discard(struct super_block *sb,
 	count = EXT4_C2B(EXT4_SB(sb), count);
 	trace_ext4_discard_blocks(sb,
 			(unsigned long long) discard_block, count);
-	if (biop) {
-		return __blkdev_issue_discard(sb->s_bdev,
-			(sector_t)discard_block << (sb->s_blocksize_bits - 9),
-			(sector_t)count << (sb->s_blocksize_bits - 9),
-			GFP_NOFS, biop);
-	} else
-		return sb_issue_discard(sb, discard_block, count, GFP_NOFS, 0);
+	return sb_issue_discard(sb, discard_block, count, GFP_NOFS, 0);
 }
 
 static void ext4_free_data_in_buddy(struct super_block *sb,
@@ -6229,8 +6222,7 @@ static void ext4_mb_clear_bb(handle_t *handle, struct inode *inode,
 		 * them with group lock_held
 		 */
 		if (test_opt(sb, DISCARD)) {
-			err = ext4_issue_discard(sb, block_group, bit, count,
-						 NULL);
+			err = ext4_issue_discard(sb, block_group, bit, count);
 			if (err && err != -EOPNOTSUPP)
 				ext4_msg(sb, KERN_WARNING, "discard request in"
 					 " group:%u block:%d count:%lu failed"
@@ -6568,7 +6560,7 @@ __acquires(bitlock)
 	 */
 	mb_mark_used(e4b, &ex);
 	ext4_unlock_group(sb, group);
-	ret = ext4_issue_discard(sb, group, start, count, NULL);
+	ret = ext4_issue_discard(sb, group, start, count);
 	ext4_lock_group(sb, group);
 	mb_free_blocks(NULL, e4b, start, ex.fe_len);
 	return ret;
-- 
2.35.3

[PATCH 2/2] ext4: make ext4_mb_release_group_pa returns void

[Guoqing Jiang]

It is always return 0 and no one check the return value too.

Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
---
 fs/ext4/mballoc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 5fabb34869bf..ae8e6d107347 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -5029,7 +5029,7 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
 	return 0;
 }
 
-static noinline_for_stack int
+static noinline_for_stack void
 ext4_mb_release_group_pa(struct ext4_buddy *e4b,
 				struct ext4_prealloc_space *pa)
 {
@@ -5043,13 +5043,11 @@ ext4_mb_release_group_pa(struct ext4_buddy *e4b,
 	if (unlikely(group != e4b->bd_group && pa->pa_len != 0)) {
 		ext4_warning(sb, "bad group: expected %u, group %u, pa_start %llu",
 			     e4b->bd_group, group, pa->pa_pstart);
-		return 0;
+		return;
 	}
 	mb_free_blocks(pa->pa_inode, e4b, bit, pa->pa_len);
 	atomic_add(pa->pa_len, &EXT4_SB(sb)->s_mb_discarded);
 	trace_ext4_mballoc_discard(sb, NULL, group, bit, pa->pa_len);
-
-	return 0;
 }
 
 /*
-- 
2.35.3